Mobile sign trailer



FIG. 1 is a rear perspective view of the mobile sign trailer of theinstant invention;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a top view thereof.

The ornamental design for a mobile sign trailer, as shown and described.